Hello, my name is madeline and i have a one month old newborn son. We started him on Gerber good start gentle when he was two weeks old. He suffered from constipation.. extremely painful bowl movemets, extreme straining and almost clay like stool, and we switched him to liquid and powder enfamil reguline. After a couple of days his bowl movements improved and he seemed to have a much easier and less painful bowl movements. My question is if we should keep him on the Enfamil reguline, (which is much harder on our wallets but easier on his stomach) or if we should switch him back to Gerber good start gentle. And when we switch him back.. do we ease into it by every other bottle or all at once. We want what is easiest and healthiest for our son. Thank you for your help.